Improvement in printing-telegraphs



T. A. EDISON.

Improvement in Printing-Telegraphs.

N0. 131,336, Patented Sep.17,1872.

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THOMAS A. EDISON, OF NEWARK, NEW JERSEY.

IMPROVEMENT IN PRlNTlNG-TELEGRAPHS.

Specification forming part of Letters Patent No. 131,336, dated September 17, 1872.

To all whom it may concern:

Be it known that I, THOMAS A. EDIsoN, of Newark, in the county of Essex and State of New Jersey, have invented an Improvement in Printing-Telegraph Instruments; and the following is hereby declared tobe a full and correct description of the same.

In this instrument there are two type-wheels one a letter-wheel, the other a figure-whee1 both revolving upon a shaft, and each sleeve or shaft and its wheel is actuated by a separate step-by-step movement.

My invention relates to two type-wheel leve'rs connected to each other by yielding or spring arms, so that when one type-wheel lever is vibrated by its 'magnet and armature to rotate its type-wheel, its spring-arm will act to vibrate the other type-wheel lever and rotate its type-wheel until said wheel is brought to the zero-point and arrested by a yielding unison stop, when the spring-arm will yield, not being of sufficient strength to move said lever against the resistance offered by the unison stop. By this arrangement of parts, if the type-wheel that has been in use is not in unison, the other type-wheel moves it forward until it reaches the zero-point, and is, in unison with the transmitter, ready to be brought into action by that instrument.

In the drawing, Figure 1 is a plan of my improved instrument, and Fig. 2 is an elevation of the same.

a is a stationary shaft sustained in the standards b b, and upon this shaft are sleeves c c, to which are secured the type-wheels d d and ratchet-wheels e 6, respectively; or two short shafts may be employed with a central support. The type-wheel d is rotated in its stepby-step movement by the electro-magnet h, armature and lever f, and wheel 6, and the typewheel (1 is rotated by the magnet h, armature and lever f, and. wheel 6, and these magnets h h are in separate electric circuits, or otherwise rendered operative upon their respective armatures. g is a spring-arm secured to the lever f, and at its outer end resting upon the lever f. g is a second arm secured to the le ver f, and resting at its outer end upon the lever f. Mare the unison arms upon their respective sleeves c c, and Z Z are yielding stops for said arms to take against in their movement.

If the type-wheel d is in use, and its lever f vibrated by its magnet h, the lever f will also be vibrated by the spring pressing up on the same,-and it will continue to actuate said lever and rotate the type-wheel duntil the arm 2' takes against the stop Z, as shown in Fig. 2, and stops said wheel at zero. The spring g now ceases to move the lever f, but yields each time the lever f is drawn down by its magnet, said arm not having suflicient strength to move the lever f and turn the ratchet 6 one tooth to carry the armZ' past the yielding stop Z. The arm g acts in a similar manner when the lever f is vibrated and the typewheel d is in use, and. brings the typewheel d to zero.

It is to be understood that the wheel being printed from is not stopped by the arm Z or 11 taking against the stop Z or Z, because the magnet is sufficiently powerful to overcome the resistance of the spring-stop and carry the arm i or Z past said stop.

The printing may be effected in any desired manner, such as by a printing lever and pad actuated by an electro-magnet in a circuit separate from the magnets h orh', or in any of the known modes.

One spring attached at both ends might be employed, instead of the two springs g g.

I claim as my invention- Two type-wheels actuated by separate stepby-step movements, in combination with spring arm or arms extending from one lever to the other, and a yielding unison stop for each type-wheel, substantially as set forth.

Signed by me this 15th day of June, A. D. 1872.

Witnesses: T. A. EDISON.

Gno. T. PINCKNEY, UHAs. H. SMITH. 

